Half to owen ii



(No Model.)

C. BIRKBRY.

FILTER.

No. 385,440. Patented July 3, 1888.

iTn STATES aTiNr riviera CORNELlUS BIRKERY, OF HARTFORD, CONNECTICUT, ASSIGNOR OF ONE HALF TO OWEhT H. JONES, OF SAME PLACE.

FELTER.

SPECIFICATION forming part. of Letters Patent No. 385,440, lated July 3, 1888.,

Application tiled Frhruai'y 2, 158s. Serial No. 262,771.

.T all whom, t may concern.'

Beit known that I, ConNnLiUs BIRKERY, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have inventedl certain new and useful Improvements in Filters, of which the following is a full, clear, and exact descrip tion, whereby any one skilled in the art can make and use the same.

My invention relates to the class of filters that are attached to the end of a faucet to arrest mechanicallysuspended impurities that are in the outtlowing liquid.

The object of the invention is to produce a filter of this class that shall be more convenient to use in certain positions, that can be easily cleaned, that is cheaply constructed, and at the same time that shall require the liquid to pass through considerable cleansing material.

Referring to the accompanying drawings, Figure l is an edge view of the filter. Fig. 2 is a plan view with the cover-plate and part of the filtering substance removed. Fig. 3 is a view in vertical section on plane denoted by line X X of Fig. 2. Fig. 4 is a detail View of the sieve used to prevent the washing away of the filtering substance.

Like letters of reference indicate the saine parts.

a denotes the body of the filter, that is cast of metal to the shape of a shallow cup, the upper edge of which cup is flanged and the inside of the flange threaded to provide a seat for the cover-plate b. This cover-plate is cast to the shape ofthe same material as thc body a, and has a thread on its periphery to fit the thread in the flanged upper edge of the body.

The letter c denotes a spiral web, that is preferably cast integral with and perpendicular to the bottom of the body. d denotes a conduit, the walls of which are east integral with the body, with an opening through it 'from the spiral channel c to the opening f, through the bottom of the body. c. is a nut, usually cast integral with the bottom of the body, and having its interior threaded to t and screw onto the threaded end of any ordi nary faucet. b' is a similar nut formed on the cover-plate b.

g denotes a spout having a thread cut on its (No model.)

outer surface that will fit theth read in the nuts c b, and a milled head, g', on one end thatean be grasped to unscrew and remove the spout when desired.

The sieves h h', which are placed in an annular groove at the bottom of the nuts a b over the openings ff', are made up of' a ring of leather or the like substance, which is slitted around its inner circumference, and in this slit the edge of a disk of Wiregauze is inserted. This construction provides at once a packing, against which the end of the faucet or spout may abut to prevent leakage, and a sieve to permit the passage of liquid, but to prevent the escape with the liquid of the filtering subtop of the spiral web, and the whole attached to a faucet by means of the thread in the nut b. 'The spout having been screwed into the nut a', any liquid passing through the faucet will enter the filter through the sieve 7L and opening f pass along the spiral channel through a considerable length of iilteriiig-matter, and then pass under the bridge d, through the opening f and sieve h, and out of the spout in au ordinary stream.V After some use the device can be unscrewed from the faucet, the spout removed from the nut cand inserted in the nut b', and the device attached to the faucet by means of the nut a. Then what liquid that passes through the filter will flow in a reverse direction to that above described, and wash out the sediment which has been collected by the filtering substance, and when the latter has become foul it can be removed and new material substituted. By simply unscrewing the cover access is had to the entire length of the spiral channel in which the filtering mate rial is packed.

My construction permits the liquid to pass in at the center and out at the center of the filter, after traveling through a considerable length of filtering-matter, without occupying but little space depthwise, which is a great advantage over the filters now in use, for if such lters were lengthened to give an amount of lOO filtering substance equal in length to the length that the liquid has to pass' through in my filter they would be inconveniently long and im practicable on that account. Another advan; tage is that the stream that issues from my filter has the same force as if coming directly from the faucet, as the cross-sectional area of the channel in the filter is nearly the same as that of the pipe it comes through. This is not so with the ordinary filter, which is swelled out to allow the liquid to traverse a large mass of cleansing material.

I claim as my inventionl. As a new article of manufacture, afilter consisting of a body provided with an integral spiral web that forms a spiral channel, and a conduit that forms an opening from the outer end ofthe spiral channel to the opening through the bottom of the body, and the cover-plate having an opening into the center ofthe body over the inner end .of the vspiral channel, and the filtering substance packed into said channel, substantially as described.

2i As a new article cf manufacture, a filter consisting of a cast-metal body provided with 

